CDI Electronics Outboard Ignition Troubleshooting Guide

89 Mercury Troubleshooting Mercury Mercury Alternator Driven Ignitions One and Two Cylinder Engines 1971-1975 (With 336-4516 Phase-Maker Ignition) SERVICE NOTE: These engines require the Orange, Red or Green Ignition coils. The Black or Blue ignition coils use a common ground connection internally for the primary and the secondary side of the coils. This system requires that the primary and the secondary side of the coils be separate as the points drive the negative side of the coil to ground, causing the coil to generate spark on the secondary side. NO SPARK ON ONE OR BOTH CYLINDERS: 1. Disconnect the Orange stop and connect it to engine ground. Retest. If the engine now has spark, the stop circuit has a fault. 2. Check the stator resistance and DVA output as given below: WIRE READ TO OEM RESISTANCE CDI RESISTANCE DVA (Connected) Red Yellow 3200-4000 (1972-73) 2000-2400 N/A Red Yellow 5300-6100 (1974-UP) 2000-2400 N/A Blue Yellow 160-200 140-180 N/A Green Engine Ground -- -- 180 V + 3. Disconnect the Brown and White points wires one at a time and retest. If the spark comes back on the one still connected when you disconnect one of them, the points or points wire is defective for the disconnected cylinder. 4. Disconnect the Green wires one at a time and retest. If the spark comes back on one cylinder, the ignition coil not connected is defective. Remember that the coils must not be the Black or Blue coils (these coils are not isolated ground). 5. Test the 336-4516 module as follows: